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4hv.org :: Forums :: Electromagnetic Radiation
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Spark Gap Transmitter

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cduma
Fri Dec 19 2008, 05:32PM Print
cduma Registered Member #1822 Joined: Fri Nov 21 2008, 08:04PM
Location:
Posts: 300
I want to build a spark gap transmitter for short experimental runs. I dont want this for malicious purposes but, to see just how bad they really are in terms of noise.

How can I get away with running it for about two minutes? Clearly I will not run it at my residence or near anyone else so they arent disturbed by it.

I want to be able to use my 7500v 30mA transformer. I think I will use the schematic that wikipedia provides.

Also, arent tesla coils considered spark gap transmitters?
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Shaun
Fri Dec 19 2008, 06:21PM
Shaun Registered Member #690 Joined: Tue May 08 2007, 03:47AM
Location: New Jersey, USA
Posts: 616
Just build a spark-gap TC, but leave out the secondary. The resonant frequency of the primary circuit will be the center transmitting frequency. Each time the spark gap fires, it will emit a noisy burst at that frequency.
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Hon1nbo
Fri Dec 19 2008, 11:08PM
Hon1nbo Registered Member #902 Joined: Sun Jul 15 2007, 08:17PM
Location: North Texas
Posts: 1040
if I were you, test in a faraday cage... assuming the frequency is not really high, just use chicken wire and make a cube large enough for it, and have your coil and signal probe inside of it (of course, do no be in it yourself)...
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Proud Mary
Fri Dec 19 2008, 11:45PM
Proud Mary Registered Member #543 Joined: Tue Feb 20 2007, 04:26PM
Location: UK
Posts: 4992
There is a circuit diagram and photographs of a tested and working spark gap tx here:

Spark Gap Transmitter Signals for Marconi Centennial
12 December 1901 to 12 December 2001


Link2
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